[minor] Refactor channel

[liamhuber]

This re-parents Channel onto HasLabel (patch) and renames the Channel.node attribute to Channel.owner (minor). As we move to composition mixins (#243), this will help break apart where channels depend on their owner being something that "has IO" and where they really depend on it being a node (basically only necessary for node injection on OutputData).

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.42% (target: -1.00%)	✅ 94.59%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (9d7b286)	3151	2734	86.77%
Head commit (d0620f0)	3254 (+103)	2837 (+103)	87.19% (+0.42%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#251)	351	332	94.59%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.42% (target: -1.00%)	✅ 94.59%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (9d7b286)	3151	2734	86.77%
Head commit (d0620f0)	3254 (+103)	2837 (+103)	87.19% (+0.42%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#251)	351	332	94.59%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

See your quality gate settings    Change summary preferences

_{You may notice some variations in coverage metrics with the latest Coverage engine update. For more details, visit the documentation}